A.I. Explanation:

First sentence: Why this is the first line? This paragraph is the first sentence because it introduces the main topic of culture. It uses a broad overview to set up the discussion about culture. It does not refer to any previous information, making it independent. Why other lines are not chosen? The other paragraphs are not chosen because they do not meet the criteria for being independent. For example, Paragraph 2 starts with "In brief," which is a transitional phrase. Paragraph 3 starts with "Expanding on these categories," which also needs prior context. Paragraph 4 uses "the non-material aspects," which assumes prior knowledge. Paragraph 5 starts with "This aspect of culture," which refers back to earlier ideas.

Concluding sentence: Why this is the last line? This paragraph is the last sentence because it summarizes the examples of material culture. It wraps up the discussion by providing a clear overview of what material culture includes.

Paragraph pairs:

• Pair 1 (Paragraph 1 → Paragraph 2): Paragraph 2 connects to Paragraph 1 because it explains the non-material aspects of culture. This follows the Broader to Specific Strategy, where the first sentence gives a general idea and the second sentence provides specific details.
• Pair 2 (Paragraph 2 → Paragraph 3): Paragraph 3 connects to Paragraph 2 because it expands on the non-material aspects mentioned in the previous paragraph. This follows the Logical Order strategy, where the second sentence builds on the ideas of the first.
• Pair 3 (Paragraph 3 → Paragraph 4): Paragraph 4 connects to Paragraph 3 because it introduces the concept of material culture as a contrast to the non-material aspects discussed before. This follows the Contrast strategy, showing the difference between non-material and material culture.
• Pair 4 (Paragraph 4 → Paragraph 5): Paragraph 5 connects to Paragraph 4 because it gives examples of what material culture includes. This follows the Topic Example strategy, where the second sentence provides specific examples related to the topic introduced in the first.